Supercharger for magnets



March 15, 1932. B. J. HASKINS 1,849,085

SUPERCHARGER FOR MAGNETS Filed May 26, 1930 WW H Patented 15, 1932UNITED STATES PATENT OFFICE BUTLER meme, OF CHICAGO, ILLINOIS, ASSIGNOB'IO JOSEPH WEIDENHOFF, INC.,

01 CHICAGO, ILLINOIS, CORPORATION 01 ILLINOIS.

surnncmoan roa manure Application fled Kay 20,

This invention relates to an alternating current supercharger formagnetizing mag- I direct. current magnetizers, and because of the heavycurrent flowing special switchboards have been required to provide aparatus capable of taking care of the are t at followed on opening thehigh amperage circuit.

An object of the present invention is to provide a simple but effectivemagnetizer which will operate off the ordinary alternating currentlighting circuit, and which requires no special apparatus to handle theare generated on opening the energizing circuit.

This and other objects, as will hereinafter appear, areaccomplished bythis invention, which is fully described in the following specificationand shown in the accompanying drawings, in which- Figure 1 is aperspective view of the supercharger; and

Fig. 2 is a wiring diagram of the same.-

supercharger having a base 10 on which are mounted two magnets 11 and12, which are energized by a rectified alternating current, as willlater be described, and which have pole pieces 13 and 14 which arepreferably placed in the same horizontal plane so as to support amagneto A. or the like, having magnets which it is desired to magnetize.The magnet coils 11 and 12 have iron cores (not shown) which areconnected through the base 10 so as to provide a continuous U- shapedmagnetic path, which is open only at the top and which is completedthrough the magnets of the magneto A when the latter is placed thereon.

Referring now to Fig. 2. An auto-transformer 15 base primary coil P anda secondary coil S. The ends of theprimary P are connected through asuitable switch 16 and flexible leads 17 with a suitable source ofalternating current 18, such as 110 volt lighting circuit. The center ofthe primary P is tapped with a lead 19 which connects with a centralpole 20 of a double pole double throw use. we no. 465,708.

reversing switch 21, thereby making each half of the prima P .asecondary during alternate half cyc es of the energizing current. Thecentral pole 20 connects through a knife 22 with contacts 23 and 24,depending on which way the knife 22 is thrown.

The contact 23 isconnected to one end of the magnet coil 12, while thecontact 24 connects through a lead 25 with the contact 26. Likewise thecontact 23 connects through a lead 27 with the contact 28. A centerpole29 of this switch carries a knife 30 similar to the knife 22 whichmoves with the knife '22, and

alternately engages the contacts 26 or 28.

- The ends of the primary coil P are connected through leads 31 and 32with the anodes or disks 33 and 34 of rectifier bulbs 35 and 36,respectively. The ends of the terminals of the filaments or cathodes 37and 38 of these bulbs are connected by means of leads 39 and 40,- andthese are connected to the ends of the secondary coil S by means ofleads 41 and 42, respectively. The lead is also connected through a lead43 with the central pole 29 7 of the reversing switch 21. The contact 26The embodiment illustrated comprises '11 as shown in Figs. 1 and 2, andthe operating switch 16 closed thereby energizing the transformer 15, aninduced current from the secondary S of the transformer 15' will heatthe filaments or cathodes 37 and 38 of the rectifier bulbs 35 and 36,thereby causing an electron flow from the cathodes to the'anodes, firstin one of these bulbs, and then in the other as the alternation of thecurrent takes place. At the same't-ime a flow of the current takes placefrom the anode 33 to the cathode 37 inthe bulb 35, and the sameflowalternating takes place in the bulb 36.

The current thus set up is a pulsating direct 1 ing coils 11 and 12 inone direction.

suspends the magneto A by a cord and bI'IDg S firstiopening the-switch16',=a'fter which the knives 22 and 30 of'the reversing switch 21current which flows alternately from the rectifier bulbs 35 and 36, and(passes through the lead 43, the knife 30,, an the lead 44, and

thence through the magnet coils 10 and 12,

the leads 46, 22, and 19, back to the center tap of the primary windinP.

The current that thus is caused to flow through the magnet coils 10 and12 is of a pulsating nature, the electromotive force of this energizingcurrent tending to take substantially the form of a rectified sine wave.The inductance of the coils 11 and 12 is so great, however, that theseact as shock coils,

charge the magnets of a magneto as A,-closes the switch, therebyenergizing the ma netizlie then it into the field of these coils so asto determine" whether the magnetizing co1ls 11 and 12 are magnetized inthe proper dlrection for further magnetizing or supercharging themagnets of this magneto. If the magnetic lines of the flux are runningin the same direction in both the magneto A and in the magnetizing coils11 and 12, the, magneto will be drawn straight down toward thesupercharg- If not, the magneto will turn as it descends so as to assumethe proper charging position.

With some magnetos the operator will merely turn the magneto so as tobring it to the correct-position. With other forms of magnetos,'however,the magneto cannot readi- 1y be reversed with respect to the pole pieces13 and 14, and in other cases it is much more desirable to do thesupercharging with the magneto A set in one positionrather than thereverse position.

Reversing'theg magne'tic flux'flthrough the magnetizing coils 11 and 12is a very simple matter with; this apparatus, and consists in arethrownfrom 'oneset of contacts across to the other, thereby reversingthedirection of current through thevcoils 11 and 12. Having done'thifs,the operator then closes the switch 16 thereby-energizing themagnetizing coils 11 and 12 inthe reverse direction.

The magneto A shown is of a type having a'flat base which readily adaptsit to be used on the supercharger, as shown. With other types ofmagnetos, however, it is not such a simple matter, and adapters (notshown) are applied on the pole pieces .13 and 14 to secondary forrectify carry the magnetic flux to the magnets to be charged.

While the transformer 15 shown is of the auto-transformer type, it willbe understood that a full transformer with a separate secondary windingmay readily be substituted therefor.

Thus it will be seen that a very simple and efl'ective\form ofmagnetizing supercharger is provided. While the magnetizing currentflowing through the coils 11 and 12 is ver heavy, the current flowingthrough the switc 16 is relatively small so that the switch 16 can beopened without d'angerto the apparatus. It will be seen, however, thatthe reversing switch 21 cannot be opened while current is thus flowingthrough the magnetiz- -ing coils, asthe are which would thus be inducedwould be so great as to do considerable damage both to the reversingswitch and to other parts of the apparatus, particularly the rectifierbulbs 35 and 36.

While I have shown and describedbut a few embodiments of my invention,it is to be understood that it is capable of many modifications.Changes, therefore, in the construction and arrangement may be madewhich do not depart from the spirit and scope of the invention asdisclosed in the appended claims.

I claim:

'1. A charger for magneto magnets comprising a transformer adapted tooperate on an alternating current line, means for rectifying the currentfrom the seco dary of the transformer, and a magnetizing coil suppliedwith current from said rectifier, said magnetizing coil being capable ofcharging a magneto magnet and serving as a choke for current from saidrectifier so as to produce a substantially even flow of current therein.

2. A charger for magneto magnets comprising a transformer adapted tooperate on an alternating current line, a rectifier bulb for rectifyingthe current" from the secondary of the transformer, and a magnetizingcoil supplied with current from said rectifier, said magnetizing coilbeing capable of charging a magneto magnet and serving as a choke forcurrent from saidrectifier so as to produce a substantially even flow ofcurrent therein. 1 3. A charger for magneto magnets comprising atransformer adapted to operate on an alternating current line, twoopposed rectifier bulbs connectedto the two ends of the ing the currentfrom the secondary of the transformer, and two adjacent magnetizingcoils supplied with current from said rectifier, said magnetizing coi lsserving as a choke for current from said rectifier so as to produceasubstantially even flow of current therein.

4 Av charger for magneto magnets comprising a transformer adapted tooperate on an alternating current line, means for rectifying the currentfromthe secondary of the transformer, two adjacent magnetizing coilssupplied with current from sai rectifier, said magnetizing coils servingas a choke for current from said rectifier so asto produce asubstantially even flow of current therein, and a switch in the primarycircuit of the transformer for o ening and closing the s me.

5. A charger yer ma eto magnets omprising a transformer a d pted t0 operto on an alternating current line, means for ectifying the current fromthe secondary of the transformer, a magnetizing coil supplied withcurrent from said rectifier, said mag-. netizing coil serving as a chokefor current .from said rectifier so as to produce a substantially evenflow of current therein, a switch in the primary circuit of thetransformer for opening and closing the same, and a switch for reversingthe direction of flow of current through said magnetizing coil.

In testimony whereof, I have hereunto set my hand this 19th day of May,1930.

BUTLER J. HASKINS.

